schema

Specifies
the file that contains a description of the database schema to which
the beans in this sun-cmp-mappings.xml file are
mapped. If this element is empty, the database schema file is automatically
generated at deployment time. Otherwise, the schema element
names a .dbschema file with a pathname relative
to the directory containing the sun-cmp-mappings.xml file,
but without the .dbschema extension. See Automatic Database Schema Capture in Sun GlassFish Enterprise Server 2.1 Developer’s Guide.